/Engine/Plugins/FX/Niagara/Source/Niagara/Classes/NiagaraPerfBaseline.h
Listener that accumulates a short run of stats for a particular baseline system. These are then stored for comparison against WIP systems in the editor to give a baseline for performance.
class FNiagaraPerfBaselineStatsListener : public [FParticlePerfStatsListener](API\Runtime\Engine\Particles\FParticlePerfStatsListener)